Chuck jaw



P. FRsTER CHUCK v JAW Filed Feb. l5 1922 2 Sheets-Sheet l Apr. 24, 1.923.

P. FRSTER CHUCK J AW Filed Feb. 13 1922 2 Sheets-Sheet 2 lrefereed am. ze, i923. I htie UNEFEE @F.FCE-

PAUL ERsrER, E NUEEMEERG,v GERMANY, Assrenort 'ro AKTIENGESELLSCHAFT vom. AnoLE EINZE a co., 0E NUREMBERG, GERMANY.

CHUCK JAW.

Application led February 13, 1922. Serial No. 536,375.

To aZZww/m, t may concern: formed in part D and a groove b is cut into 50 Be it known that I, PAUL FRs'rEn, a citithe same. The jaw part C is provided with Zen of the German Republic, residing at a dove-tailed groove. adapted to receive the Nuremberg, Germany, have invented certongue a. The connection of the parts would tain new and useful Improvements in Chuck be non-rigid at this state.

Jaws (for which application for patent has There is further provided a tightening been led in Germany on the 9th or March, piece e embedded in jaw part C. A shoulder 1921), of which the following is a specica- 7 out out of this tightening piece forms a tien nose g which engages with the groove Z).

10 The chuck` jaws, as now built, and com- .in said tightening piece e an internal thread posed of several nested ireely oscillating 1s provided into which ts the screw 71,. 60 parte, designed te equalize the pressure and Below the tightening piece e there is further to clamp and accommodate different shaped arranged a pressure spring z'. articles, lack the provision of some means The device operates as follows for locking said oscillating parts in their The spring z' and the tightening piece e adjusted position and preventing them from are inserted into the jaw part C prior to the assuming their original position during the. assembling of parts C and D, whereupon the release of one article and the substitution dove-tailed part c of part C abuts the underof another of the same type and size. This Cut Side of the tongue a of part D. Whilst so is especially of importance in quantity propart C is being inserted intoV the part D the duction where large quantities of work tightening piece e has to be pressed down pieces of the same type and size have to be so that its nose g engages with groove b. clamped, and must always have exactly the The screw 7i is tightened, whereby the two same position relatively to the tool. jaw parts C and D are rigidly connected a5 This inconvience is obviated by the presthe one with the other. If the screw h is ent invention which is illustrated in the acloosened, part C can he turned relatively to companylng drawing, wherein part D. Spring z' serves for yieldably press- Fig. l shows the clamping jaws in front ing the nose against the upper part of elevation. groove b even if the screw /z is loosened, so

3-0 Fig. 2 is a section on line X-Y of Fig. 1. that, owing to the increase of friction of the Fig. 3 is a view similar to Fig. 2 showing two parts the one upon the other which is 80 a modification. n thus produced, the mutual rotation of the Fig. 4; shows the jaws in position to clamp partsis rendered more diiiicult. an irregularly shaped article. This connection can be used also for the 35 Referring to Fig. l the jaws A and B for next greater and the next smaller parts.

clam ing the work piece are mounted in If itis desirablethatthe jaw be not locked, arc-s aped recesses in the part C so that but the advantages which result from the they can pivot around the centers m and n uniform pressure of the spring retained, a of said arcs or guides. The part C which bolt Z of convenient shape can be substituted 40 comes next in size to the jaws A and B is for the tightening piece e and screw 7L (see similarly mounted in the jaw part D which Fig. 3) which serves as a stop for part C 90 comes next in size so that it can pivot around which need not be locked if it is used as end the center 0 of its arc-shaped guide and so part of the jaw. lt is suiiicient if the parts forth. This arrangement is known and the situated behind part C are adapted to be 45 improvement starts from this point. locked..

Fig. 2 (section on line X-Y of Fig. l) T cla1m:- 95 shows the jaw part C which is slidably con- A jaw part having a tongue and groove nected with the jaw part D of larger size. engagement with an arc shaped seat or guide A tongue a, of dove-tailed cross section is and a perforation parallel to the axis of the arc and intersecting the engaging parte, a n testimony whereof I a'HX my signature tlghtenmg plece 1n sind perfomuon han/lng 1n presence of two Wltnesses, e shoulder engaglng a groove 1n the gulde,

a spring for yieldably pressing Said shoul- PUL FORSTER der agalnst the gulde and a screw7 for posl- Wltnesses:

tlvely securing the plece 1n tlgh'tened po- LEXEI PHlLIPPo'F,

ALEXANDER DE SOTE. 

